Answer:
D. Mountains
Explanation:
Sinkholes are caused by cave ins, valleys are in between mountains, and buttes are most likely caused by erosion after the sand and soil got blown away. Mountains are caused by two plates slamming into each other and going sky-wise.
Answer:CD4, or helper, T cells coordinate the immune response. These are the primary targets of HIV. As the virus destroys CD4 cells, people become susceptible to opportunistic infections and cancers
Explanation:
As the fetus develops inside a woman's uterus, another vital structure is in place to provide a vital service to mother and child: the placenta. It is a spongy structure, filled with blood vessels that come from the mother by way of the lining of the uterus, and then connects with the baby by the umbilical cord
The biggest terrestrial mammals on Earth are African elephants. Their wider ears, which resemble the continent of Africa somewhat, help to distinguish them from their Asian kin. (Elephants in Asia have more compact, rounder ears.)
<h3>What are the large species of elephant?</h3>
Scientists have discovered that there are actually two species of African elephants, despite the fact that they were previously considered to be a single species. Both of these species are endangered.
While forest elephants are smaller creatures that dwell in the woods of Central and West Africa, savanna elephants are larger creatures that wander the plains of sub-Saharan Africa. Savanna elephants are classified as endangered by the International Union for the Conservation of Nature, whereas forest elephants are classified as severely endangered.
Learn more about species of elephant here:
brainly.com/question/2021627
#SPJ1